Filter assembly



FIG. 1 is a perspective view of a filter assembly showing the new design;

FIG. 2 is a front elevational view thereof, wherein the right and left side and rear elevational views are identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a filter assembly, as shown and described. 